Speedmaster Moonwatch Chronograph | 39.70 mm | ManualHaving been a part of all six lunar missions, the legendary OMEGA Speedmaster is one of the worlds most iconic timepieces. This model has reprised the famous Calibre 321, which was an important part of the Speedmasters original space history. The 39. 70 mm case is in stainless steel and is inspired by the same 3rd generation style that astronaut Ed White wore during Americas first spacewalk in 1965. There is also a bezel ring in polished black ceramic